Originally posted by Terry Haines:
Cant agree,some time ago I put up some pics of main & rod end bearings,no oil failure on these engines as they were static in a dyno cell....no 'long turns' either....just because you can't see or feel anything this does not mean the matearial,the crank, is not suffering from fatigue.Without stripping and doing regular met lab tests for microstructure you will see,feel or hear nothing.... 
Terry - curious about crankshafts.
Aren't all BMW 6's I6, and don't they all come with dual mode dampers? Just curious, since everyone quotes this Dinan (and also seen the Supra articles saying the same thing, also I6 engine IIRC) as saying UDP's will cause a quick death. Is an I6 crank (in general) longer and inherently more susceptible to torsional vibe harmonics than say our 60 deg V6?
I know that physics is physics and we UDP users are "abusing our cranks" so to speak, but could the difference in 60degree V6 to I6 (which I think also have crank throws at 60 don't they?) may be responsible for the difference in timeliness of deaths from Contours (proven > 40k with no obvious problems) to BMW's (dying at one track event).
Any insight?
